American biologists say they have increased their population by rebuilding endangered sturgeon.
Roger Clint, a water biologist, said, "When the first sturgeon began to breed, nobody saw the sturgeon. Even biologists have not seen one. "
The endangered sturgeon once was in the Great Lakes of the region, but its number has decreased due to overfishing, new dam construction and pollution.
"There are about 20 kinds of sturgeon in the world and they have changed little since the time of the dinosaurs," said Scart biologists from the federal fish and avian animal services. But in a century, he said, almost extinction of thistle sharks was said.
However, at present, sturgeon is finally increasing in number. Biologists captured and raised sturgeon with a life span of more than 25 years and radiated more than 100,000 sturgeon onto the New York waterway.
"Our efforts have greatly increased the number of sturgeon fish," said Geoff Zahraqi, an environmental research manager at New York Power Oth. The state funded the effort since 2003.
The group said it will increase the number of sturgeon fish to 10,500 by the autumn of this year.